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-rw-r--r--src/qcam/dng_writer.cpp120
1 files changed, 108 insertions, 12 deletions
diff --git a/src/qcam/dng_writer.cpp b/src/qcam/dng_writer.cpp
index d5270323..e55985ba 100644
--- a/src/qcam/dng_writer.cpp
+++ b/src/qcam/dng_writer.cpp
@@ -25,6 +25,9 @@ struct FormatInfo {
CFAPatternColour pattern[4];
void (*packScanline)(void *output, const void *input,
unsigned int width);
+ void (*thumbScanline)(const FormatInfo &info, void *output,
+ const void *input, unsigned int width,
+ unsigned int stride);
};
void packScanlineSBGGR10P(void *output, const void *input, unsigned int width)
@@ -57,46 +60,70 @@ void packScanlineSBGGR12P(void *output, const void *input, unsigned int width)
}
}
+void thumbScanlineSBGGRxxP(const FormatInfo &info, void *output,
+ const void *input, unsigned int width,
+ unsigned int stride)
+{
+ const uint8_t *in = static_cast<const uint8_t *>(input);
+ uint8_t *out = static_cast<uint8_t *>(output);
+
+ /* Number of bytes corresponding to 16 pixels. */
+ unsigned int skip = info.bitsPerSample * 16 / 8;
+
+ for (unsigned int x = 0; x < width; x++) {
+ *out++ = (in[0] + in[1] + in[stride] + in[stride + 1]) >> 2;
+ in += skip;
+ }
+}
+
static const std::map<PixelFormat, FormatInfo> formatInfo = {
{ PixelFormat(DRM_FORMAT_SBGGR10, MIPI_FORMAT_MOD_CSI2_PACKED), {
.bitsPerSample = 10,
.pattern = { CFAPatternBlue, CFAPatternGreen, CFAPatternGreen, CFAPatternRed },
.packScanline = packScanlineSBGGR10P,
+ .thumbScanline = thumbScanlineSBGGRxxP,
} },
{ PixelFormat(DRM_FORMAT_SGBRG10, MIPI_FORMAT_MOD_CSI2_PACKED), {
.bitsPerSample = 10,
.pattern = { CFAPatternGreen, CFAPatternBlue, CFAPatternRed, CFAPatternGreen },
.packScanline = packScanlineSBGGR10P,
+ .thumbScanline = thumbScanlineSBGGRxxP,
} },
{ PixelFormat(DRM_FORMAT_SGRBG10, MIPI_FORMAT_MOD_CSI2_PACKED), {
.bitsPerSample = 10,
.pattern = { CFAPatternGreen, CFAPatternRed, CFAPatternBlue, CFAPatternGreen },
.packScanline = packScanlineSBGGR10P,
+ .thumbScanline = thumbScanlineSBGGRxxP,
} },
{ PixelFormat(DRM_FORMAT_SRGGB10, MIPI_FORMAT_MOD_CSI2_PACKED), {
.bitsPerSample = 10,
.pattern = { CFAPatternRed, CFAPatternGreen, CFAPatternGreen, CFAPatternBlue },
.packScanline = packScanlineSBGGR10P,
+ .thumbScanline = thumbScanlineSBGGRxxP,
} },
{ PixelFormat(DRM_FORMAT_SBGGR12, MIPI_FORMAT_MOD_CSI2_PACKED), {
.bitsPerSample = 12,
.pattern = { CFAPatternBlue, CFAPatternGreen, CFAPatternGreen, CFAPatternRed },
.packScanline = packScanlineSBGGR12P,
+ .thumbScanline = thumbScanlineSBGGRxxP,
} },
{ PixelFormat(DRM_FORMAT_SGBRG12, MIPI_FORMAT_MOD_CSI2_PACKED), {
.bitsPerSample = 12,
.pattern = { CFAPatternGreen, CFAPatternBlue, CFAPatternRed, CFAPatternGreen },
.packScanline = packScanlineSBGGR12P,
+ .thumbScanline = thumbScanlineSBGGRxxP,
} },
{ PixelFormat(DRM_FORMAT_SGRBG12, MIPI_FORMAT_MOD_CSI2_PACKED), {
.bitsPerSample = 12,
.pattern = { CFAPatternGreen, CFAPatternRed, CFAPatternBlue, CFAPatternGreen },
.packScanline = packScanlineSBGGR12P,
+ .thumbScanline = thumbScanlineSBGGRxxP,
} },
{ PixelFormat(DRM_FORMAT_SRGGB12, MIPI_FORMAT_MOD_CSI2_PACKED), {
.bitsPerSample = 12,
.pattern = { CFAPatternRed, CFAPatternGreen, CFAPatternGreen, CFAPatternBlue },
.packScanline = packScanlineSBGGR12P,
+ .thumbScanline = thumbScanlineSBGGRxxP,
} },
};
@@ -118,40 +145,101 @@ int DNGWriter::write(const char *filename, const Camera *camera,
return -EINVAL;
}
+ /*
+ * Scanline buffer, has to be large enough to store both a RAW scanline
+ * or a thumbnail scanline. The latter will always be much smaller than
+ * the former as we downscale by 16 in both directions.
+ */
+ uint8_t scanline[(config.size.width * info->bitsPerSample + 7) / 8];
+
+ toff_t rawIFDOffset = 0;
+
+ /*
+ * Start with a thumbnail in IFD 0 for compatibility with TIFF baseline
+ * readers, as required by the TIFF/EP specification. Tags that apply to
+ * the whole file are stored here.
+ */
const uint8_t version[] = { 1, 2, 0, 0 };
- const uint16_t cfa_repeatpatterndim[] = { 2, 2 };
+
TIFFSetField(tif, TIFFTAG_DNGVERSION, version);
TIFFSetField(tif, TIFFTAG_DNGBACKWARDVERSION, version);
+ TIFFSetField(tif, TIFFTAG_FILLORDER, FILLORDER_MSB2LSB);
+ TIFFSetField(tif, TIFFTAG_MAKE, "libcamera");
+ TIFFSetField(tif, TIFFTAG_MODEL, camera->name().c_str());
+ TIFFSetField(tif, TIFFTAG_UNIQUECAMERAMODEL, camera->name().c_str());
+ TIFFSetField(tif, TIFFTAG_SOFTWARE, "qcam");
+ TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
+
+ /*
+ * Thumbnail-specific tags. The thumbnail is stored as a greyscale image
+ * with 1/16 of the raw image resolution.
+ */
+ TIFFSetField(tif, TIFFTAG_SUBFILETYPE, FILETYPE_REDUCEDIMAGE);
+ TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, config.size.width / 16);
+ TIFFSetField(tif, TIFFTAG_IMAGELENGTH, config.size.height / 16);
+ TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, 8);
+ TIFFSetField(tif, TIFFTAG_COMPRESSION, COMPRESSION_NONE);
+ TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_MINISBLACK);
+ TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
+ TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
+ TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, SAMPLEFORMAT_UINT);
+
+ /*
+ * Reserve space for the SubIFD tag, pointing to the IFD for the raw
+ * image. The real offset will be set later.
+ */
+ TIFFSetField(tif, TIFFTAG_SUBIFD, 1, &rawIFDOffset);
+
+ /* Write the thumbnail. */
+ const uint8_t *row = static_cast<const uint8_t *>(data);
+ for (unsigned int y = 0; y < config.size.height / 16; y++) {
+ info->thumbScanline(*info, &scanline, row,
+ config.size.width / 16, config.stride);
+
+ if (TIFFWriteScanline(tif, &scanline, y, 0) != 1) {
+ std::cerr << "Failed to write thumbnail scanline"
+ << std::endl;
+ TIFFClose(tif);
+ return -EINVAL;
+ }
+
+ row += config.stride * 16;
+ }
+
+ TIFFWriteDirectory(tif);
+
+ /* Create a new IFD for the RAW image. */
+ const uint16_t cfaRepeatPatternDim[] = { 2, 2 };
+ const uint8_t cfaPlaneColor[] = {
+ CFAPatternRed,
+ CFAPatternGreen,
+ CFAPatternBlue
+ };
+
TIFFSetField(tif, TIFFTAG_SUBFILETYPE, 0);
TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, config.size.width);
TIFFSetField(tif, TIFFTAG_IMAGELENGTH, config.size.height);
TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, info->bitsPerSample);
TIFFSetField(tif, TIFFTAG_COMPRESSION, COMPRESSION_NONE);
TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_CFA);
- TIFFSetField(tif, TIFFTAG_FILLORDER, FILLORDER_MSB2LSB);
- TIFFSetField(tif, TIFFTAG_MAKE, "libcamera");
- TIFFSetField(tif, TIFFTAG_MODEL, camera->name().c_str());
- TIFFSetField(tif, TIFFTAG_UNIQUECAMERAMODEL, camera->name().c_str());
- TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
- TIFFSetField(tif, TIFFTAG_SOFTWARE, "qcam");
TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, SAMPLEFORMAT_UINT);
- TIFFSetField(tif, TIFFTAG_CFAREPEATPATTERNDIM, cfa_repeatpatterndim);
+ TIFFSetField(tif, TIFFTAG_CFAREPEATPATTERNDIM, cfaRepeatPatternDim);
TIFFSetField(tif, TIFFTAG_CFAPATTERN, info->pattern);
- TIFFSetField(tif, TIFFTAG_CFAPLANECOLOR, 3, "\00\01\02");
+ TIFFSetField(tif, TIFFTAG_CFAPLANECOLOR, 3, cfaPlaneColor);
TIFFSetField(tif, TIFFTAG_CFALAYOUT, 1);
/* \todo Add more EXIF fields to output. */
/* Write RAW content. */
- const uint8_t *row = static_cast<const uint8_t *>(data);
- uint8_t scanline[(config.size.width * info->bitsPerSample + 7) / 8];
+ row = static_cast<const uint8_t *>(data);
for (unsigned int y = 0; y < config.size.height; y++) {
info->packScanline(&scanline, row, config.size.width);
if (TIFFWriteScanline(tif, &scanline, y, 0) != 1) {
- std::cerr << "Failed to write scanline" << std::endl;
+ std::cerr << "Failed to write RAW scanline"
+ << std::endl;
TIFFClose(tif);
return -EINVAL;
}
@@ -159,6 +247,14 @@ int DNGWriter::write(const char *filename, const Camera *camera,
row += config.stride;
}
+ /* Checkpoint the IFD to retrieve its offset, and write it out. */
+ TIFFCheckpointDirectory(tif);
+ rawIFDOffset = TIFFCurrentDirOffset(tif);
+ TIFFWriteDirectory(tif);
+
+ /* Update the IFD offsets and close the file. */
+ TIFFSetDirectory(tif, 0);
+ TIFFSetField(tif, TIFFTAG_SUBIFD, 1, &rawIFDOffset);
TIFFWriteDirectory(tif);
TIFFClose(tif);
generated by cgit v1.2.1 (git 2.18.0) at 2024-06-02 01:55:43 +0000